Five year old Harry Potter felt pain like he never had before. Sure, his relatives hated him and had done so for as long as he could remember, but never had Uncle Vernon beat him before. Dudley pinched and hit him, but that was more of an annoyance than actual pain. No, this was actual pain. The feeling of a whale of a man punching a little boy in the stomach. The feeling of blood shed and the edges of unconsciousness approaching. The feelings that Harry was currently feeling thanks to his less than loving uncle.
Why was Harry being hurt? He couldn't tell you. All that happened was his teacher's hair turned blue today in class. How was that his fault? Sure, she was yelling at him in class for not knowing his name, but the Dursley's had always just called him boy or freak, never Harry. He didn't think it could have possibly been his fault for her hair changing colors, but naturally like everything else that happened around him, it was his fault. Vernon losing a business deal, the food getting burnt even when he wasn't cooking it, something breaking in the house, or his personal favorite and the most common thing he was blamed for, his hair growing back faster than his aunt could cut it. 'Must come from my parents,' he once thought.
Today though, he was not thinking about hair. He was hoping that anything could stop the pain he was currently feeling. His anger started to rise. 'Why do they hate me? Why is he hitting me? What did I do wrong?' These thoughts and more were going through little Harry's head as his uncle continued to beat him. Then suddenly, a feeling occurred deep within him. A strange new feeling that left Harry feeling powerful and he liked it. Without consciously thinking it, Harry emitted a blast of pure magic from within himself hitting Vernon, then Dudley, then Petunia, and finally encompassing the whole house, then the neighborhood, stretching out across England and finally covering the whole Island of Great Britain.
Many things occurred all at once across the island. His relatives were knocked unconscious. Mysterious wards with evil intent were destroyed from around his house, Alarms flared in a bank run by creatures not seen by most muggles, causing them to run around as if preparing for a special guest; all with feral grins on their faces that would have scared men braver than you and me. Magical people across England felt a pulse in their magic, not felt since the last Magical King and Queen passed on without a known heir, not that they knew this, yet each and every magical called out, "Long live the King of Magical Britain!" to their great confusion. An old man living in isolation in Scotland smiled, raising his goblet to the air saying, "Welcome back, Prince Harry. Prince of The Greater Isles and of Camelot" before vanishing to places unknown. A large emerald gem sitting above a throne started to glow, causing all around to spread the news of the return of their King. A red ruby began to glow over a throne in Windsor Castle where a meeting on the Royal Family was occurring startling all present; none of whom had ever seem such a phenomenon ever before.
An old man sitting in his office noticed his silver instruments tied to a certain house and a certain boy shatter into thousands of pieces before the enchantments placed directly on himself blasted him back into his wall, knocking him unconscious for seven long years. Locket, diadem, cup, ring, and diary all exploded and a loud scream of pain was heard by none. A wraith far off in Albania felt pain like it had not felt since that fateful night and flashed out of existence, never to return again. And finally, a young girl of six-years-old felt a flame kindle in her heart, too young to understand the beginnings of a soul bond being formed. All she knew was she liked the feeling and fell asleep dreaming about a black haired, green eyed boy who made her smile in her sleep.
And what of this boy? The use of so much pure magic would obviously affect the core of a full adult. A normal young child using this much energy would normally nearly deplete his core and then stretch its potential for future use, but Harry is and never was not normal. Even his core was not normal since it was under block from not one, but three magical bonds all three of which were destroyed causing his magical core to grow exponentially.
Using so much magic all at once knocked Harry unconscious, leaving him in a mild coma lasting three days. Three days later, young Harry would wake up to find everything changed beyond his wildest dreams.